810219238920 has 512 divisors, whose sum is σ = 3343713408000. Its totient is φ = 170943851520.

The previous prime is 810219238889. The next prime is 810219238931. The reversal of 810219238920 is 29832912018.

It is a happy number.

810219238920 is a `hidden beast` number, since 81 + 0 + 2 + 192 + 389 + 2 + 0 = 666.

It is a super-2 number, since 2×810219238920² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 16584930 + ... + 16633710.

It is an arithmetic number, because the mean of its divisors is an integer number (6530690250).

Almost surely, 2^810219238920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 810219238920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1671856704000).

810219238920 is an abundant number, since it is smaller than the sum of its proper divisors (2533494169080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

810219238920 is a wasteful number, since it uses less digits than its factorization.

810219238920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48847 (or 48811 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 810219238920 in words is "eight hundred ten billion, two hundred nineteen million, two hundred thirty-eight thousand, nine hundred twenty".